esoc: mdm-4x: handle atomic context better

Function mdm_notify() is executed in atomic context when kernel crash so
using jiffies and sleep are not proper way.  Use local_clock() and mdelay()
instead.  Also reduce timeout to 3 seconds per mdm's spec.

CRs-fixed: 612545
Change-Id: I557ec08d5960c9c7caa5a9d4d15e79f70eedd8b0
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>